Learn Golang in depth: Flexible application of timestamp acquisition techniques

Golang Advanced: Master the acquisition and application of timestamps

Timestamps are a way of expressing time in computer systems, based on a specific Time is the starting point, the number of seconds or milliseconds from a time point in the past or future to the starting point. In development, timestamp is very important. It is often used to record the time when an event occurs and perform time comparison and calculation. This article will introduce how to obtain timestamps in Golang, and demonstrate various applications of timestamps through specific code examples.

1. Get the current timestamp
In Golang, you can easily get the current timestamp through the functions provided by the time package. The following is a sample code:

package main

import (
    "fmt"
    "time"
)

func main() {
    timestamp := time.Now().Unix()
    fmt.Println("当前时间戳:", timestamp)
}

Running the above code will output the current timestamp, and the result will be similar to: current timestamp: 1605721708.

2. Timestamp formatting
The default timestamp is an integer in seconds, which is not very intuitive. For better readability, we can format the timestamp to a specified datetime format. The time package in Golang provides the Format function to implement formatting operations. The following is a sample code:

package main

import (
    "fmt"
    "time"
)

func main() {
    timestamp := time.Now().Unix()
    fmt.Println("当前时间戳:", timestamp)

    tm := time.Unix(timestamp, 0)
    fmt.Println("格式化时间:", tm.Format("2006-01-02 15:04:05"))
}

Run the above code, in addition to outputting the current timestamp, the formatted time is also output, for example: formatted time: 2020-11-19 08:08:24.

It is worth noting that the formatting of time in Golang adopts a special format, such as "2006-01-02 15:04:05" in the above example, where the numbers are fixed, respectively. Represents year, month, day, hour, minute and second. This is to commemorate the time when Golang was born.

3. Convert timestamp to time type
Sometimes we need to convert timestamp to time type in Golang to facilitate time operations. The time package in Golang provides Unix and UnixNano functions to convert timestamps to time types. The following is a sample code:

package main

import (
    "fmt"
    "time"
)

func main() {
    timestamp := time.Now().Unix()
    fmt.Println("当前时间戳:", timestamp)

    tm := time.Unix(timestamp, 0)
    fmt.Println("时间类型:", tm)
}

Run the above code, in addition to outputting the current timestamp, it also outputs the result converted to a time type, for example: Time type: 2020-11-19 08:08:24 0800 CST.

4. Calculation of timestamps
In addition to obtaining and formatting timestamps, addition and subtraction operations can also be performed to achieve time calculation. The time type in Golang provides the Add method and Sub method to perform time addition and subtraction operations. The following is a sample code:

package main

import (
    "fmt"
    "time"
)

func main() {
    tm := time.Now()
    fmt.Println("当前时间:", tm)

    oneHourLater := tm.Add(time.Hour)
    fmt.Println("一小时后的时间:", oneHourLater)

    threeDaysAgo := tm.AddDate(0, 0, -3)
    fmt.Println("三天前的时间:", threeDaysAgo)

    duration := oneHourLater.Sub(threeDaysAgo)
    fmt.Println("时间间隔:", duration)
}

Run the above code, in addition to outputting the current time, it also outputs the results after addition and subtraction, for example: time one hour later: 2020-11-19 09:08: 24.0103487 0800 CST, time three days ago: 2020-11-16 08:08:24.0103487 0800 CST, time interval: 24h0m0s.

Through the above code example, we can see how to use the Add and Sub methods to add and subtract time, and get the result of the time interval.

Summary
Time stamps are very important in development and can be used to record the occurrence time of events, compare times, calculate time, etc. This article uses specific code examples to introduce how to obtain timestamps in Golang, as well as timestamp formatting, conversion and calculation applications. I hope it will be helpful to readers and improve their understanding of timestamps in Golang.

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